Global Positioning System Reference
In-Depth Information
FIGURE 6.4. The route taken by Christopher Columbus on his first voyage. On
the outward journey, in the mid-Atlantic, he noticed that his compass no longer
pointed at Polaris—the first recorded observation of magnetic declination. Earlier
German maps suggest that the phenomenon of magnetic declination was known,
but this knowledge was not explicitly recorded.
FIGURE 6.5. Christopher Columbus. The first voyage of Columbus is celebrated on
both sides of the Atlantic—and in the middle of it. This statue is on the island of
Madeira. Photo by Waldemar J. Poerner.
 
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